Gable Roof Sheathing

The Gable Roof Sheathing Calculator is designed to help you estimate the amount of plywood needed to cover a gable roof, including accounting for waste. By entering the building length and width in feet and inches, eave and gable overhang in inches, and the roof pitch, you can calculate the total roof area, the number of plywood sheets required, and the additional amount due to waste. The calculation is based on the fact that one sheet of Plywood or OSB (Oriented Strand Board) is a 4' x 8' size. One sheet = 32 ft²

Calculator

1. enter the building length in feet and inches
2. the building width, the "gable side" in feet and inches
3. gable overhang in inches
4. eave overhang in inches
5. enter the roof pitch as a ratio of rise over 12 inches (e.g., a 6 for a 6:12, etc.)
6. the percentage of waste (default is 10%)

Results

1. the area of the roof in square feet
2. the estimated number of 4x8 plywood or OSB sheets required to cover the calculated roof area
3. the extra sheets needed due to waste during installation (e.g., cutting, mistakes, or irregularities in the roof shape). It is calculated based on the specified waste percentage
4. the total number of plywood sheets required for the project, including the waste amount